Turns out the source of many germs in a hotel room is the air conditioning unit.
The filters need to be cleaned at least 4 times a year and, if they are not, you could be breathing in noxious air.
According to this article, a rise in flu has been linked to dirty air conditioning units.
It does make you think about all places AC is in common use - most offices for example now have AC. Could explain a lot of absenteeism.
Dirty glasses, unwashed bedspreads and grimy TV remotes are just some of the items that guests are told to avoid. A former hotel manager has since revealed one part of the room that nearly every guest uses, and why they should avoid it.